> the hyphen-minus is too narrow. You can replace the minus signs with a wider dash, but that is semantically wrong and also a pain in the arse.
In this case, an alternative to "-", U+002D HYPHEN-MINUS, is "−", U+2212 MINUS SIGN. On Linux, I considered mapping the keypad substract key to it, but instead I configured a xcompose alias.
It vexes me that almost no one uses the real minus sign. But you also can't blame them since it's never been made readily-available. So you really have to be pedantic and spend time going to get it if you want to use it.
Most people aren't even aware there's a "real" (or rather, fake) minus sign. I didn't know until reading this thread. The hyphen is right next to the +/= key, so it's not unreasonable at all to think the _/- key is minus.
Yeah I had no idea either, but I'm sorry to say it's going in the same bucket as using a real em-dash vs a double hypen--if it's not on my keyboard it's not gonna happen.
Re “configured”—what's your locale? In en_US.UTF-8 on my Arch system it's in the system file (/usr/share/X11/locale/en_US.UTF-8/Compose) as <Multi_key> <minus> <underscore>.
